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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Saint Charles, Iowa, with an average temperature fluctuating between 15.3°F (-9.3°C) and 28.8°F (-1.8°C). January is the coldest month of the year, registering average temperatures as high as 28.8°F (-1.8°C) and as low as 15.3°F (-9.3°C). Weather in January »
Weather in February
February, the last month of the winter in Saint Charles, is an icy month, with an average temperature fluctuating between 32.5°F (0.3°C) and 18.3°F (-7.6°C). The transition into February shows a subtle variation to an icy 32.5°F (0.3°C) from January's 28.8°F (-1.8°C) in the average high-temperature. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Saint Charles, Iowa, with an average temperature varying between 32.5°F (0.3°C) and 47.8°F (8.8°C). March's arrival sees a clear escalation in the average high-temperature, rising from February's cold 32.5°F (0.3°C) to a chilly 47.8°F (8.8°C). Weather in March »
Weather in April
April is a moderate spring month in Saint Charles, Iowa, with an average temperature ranging between max 59.7°F (15.4°C) and min 42.3°F (5.7°C). April comes with an increase, with the average high-temperature moving from a frosty 47.8°F (8.8°C) in March to a refreshing 59.7°F (15.4°C). Weather in April »
Weather in May
May, the last month of the spring in Saint Charles, is an agreeable month, with temperature in the range of an average low of 52.7°F (11.5°C) and an average high of 69.4°F (20.8°C). With the onset of May, Saint Charles's average high-temperature experiences a rise, moving from April's refreshing 59.7°F (15.4°C) to an agreeable 69.4°F (20.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Saint Charles, Iowa, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 63°F (17.2°C). June's onset witnesses a shift in the average high-temperature, moving from an agreeable 69.4°F (20.8°C) in May to a warm 79.7°F (26.5°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Saint Charles, Iowa, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 65.1°F (18.4°C). July, known for its average high temperature of 83.3°F (28.5°C) and an average low temperature of 65.1°F (18.4°C), is the warmest month. In July, the average heat index is evaluated at a tropical 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Saint Charles, Iowa, with an average temperature fluctuating between 62.6°F (17°C) and 81.5°F (27.5°C). The start of August sees the average high-temperature at a still moderately hot 81.5°F (27.5°C), showing little difference from July's 83.3°F (28.5°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Saint Charles, Iowa, with an average temperature ranging between min 55.9°F (13.3°C) and max 75.4°F (24.1°C). Saint Charles's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's 81.5°F (27.5°C) to a still moderately hot 75.4°F (24.1°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Saint Charles, Iowa, with an average temperature ranging between max 60.8°F (16°C) and min 44.2°F (6.8°C). The start of October signals a clear decrease in the average high-temperature, falling from a warm 75.4°F (24.1°C) in September to a refreshing 60.8°F (16°C). Weather in October »
Weather in November
November, the last month of the autumn in Saint Charles, is another chilly month, with an average temperature fluctuating between 32.7°F (0.4°C) and 47.3°F (8.5°C). With the beginning of November, the average high-temperature shows a decrease, transitioning from an enjoyable 60.8°F (16°C) in October to a chilly 47.3°F (8.5°C). Weather in November »
Weather in December
December, the first month of the winter in Saint Charles, is also an icy month, with temperature in the range of an average low of 22.5°F (-5.3°C) and an average high of 34.3°F (1.3°C). Arrival of December comes with a reduction in the average high-temperature, falling from a frosty 47.3°F (8.5°C) in November to a cold 34.3°F (1.3°C). Weather in December »
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
Saint Charles records the coldest temperatures in January, averaging a high of 28.8°F (-1.8°C) and a low of 15.3°F (-9.3°C).
What are the most humid months?
The months with the highest humidity are January, February and June, with an average relative humidity of 82%.
What is the driest month?
The month with the least rainfall is January, when the rain falls for 3.8 days and typically collects 0.91" (23mm) of precipitation.
How many days does it rain?
In Saint Charles, during the entire year, the rain falls for 133 days and collects up to 26.14" (664mm) of precipitation.
When does it snow?
Months with snowfall are January through May, October through December.
How many days does it snow in Saint Charles?
Throughout the year, there are 35 snowfall days, and 15.04" (382mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 4.4h of sunshine, January has the least sunshine of the year in Saint Charles, Iowa.
When is the lowest UV index?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 8.3 days and accumulates 4.53" (115mm) of snow.
When is Daylight Saving Time (DST) in Saint Charles?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the rainiest month?
May is the month with the most rainfall. Rain falls for 17.5 days and accumulates 3.98" (101mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
With an average of 15h and 6min of daylight, June has the longest days of the year.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What month is the hottest in Saint Charles?
Saint Charles reaches its average highest temperatures in July, measuring 83.3°F (28.5°C) at the peak and 65.1°F (18.4°C) at the lowest.
What month has the most sunshine?
With an average of 10.3h of sunshine, July has the most sunshine of the year.
What is the least humid month?
October is the least humid month, with an average relative humidity of 71%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Saint Charles, IA
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure
Saint Charles, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Saint Charles, IA
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.8mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7mph - Average wind speed in September:
8.1mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity
Saint Charles, IA
The months with the highest relative humidity are January, February and June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Saint Charles, IA
- Average rainfall in January:
0.91" - Average rainfall in February:
1.06" - Average rainfall in March:
1.77" - Average rainfall in April:
2.76" - Average rainfall in May:
3.98" - Average rainfall in June:
3.78"
The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days
Saint Charles, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.8 days - Average rainfall days in March:
10.5 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
17.9 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
13.7 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
7.4 days - Average rainfall days in December:
5.9 days
The month with the highest number of rainy days is June (17.9 days).
The months with the least rainy days are January and February (3.8 days).
Average snowfall
Saint Charles, IA
- Average snowfall in January:
4.29" - Average snowfall in February:
4.53" - Average snowfall in March:
1.97" - Average snowfall in April:
0.91" - Average snowfall in May:
0.35" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Saint Charles, IA
- Average snowfall days in January:
9.1 days - Average snowfall days in February:
8.3 days - Average snowfall days in March:
5 days - Average snowfall days in April:
1.7 days - Average snowfall days in May:
0.2 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
2.7 days - Average snowfall days in December:
7.5 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Charles, IA
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
5h and 0min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days
Saint Charles, IA
- Average sunshine days in January:
19.1 days - Average sunshine days in February:
16.7 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
13.2 days - Average sunshine days in May:
11 days - Average sunshine days in June:
9.8 days
- Average sunshine days in July:
11.9 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
20.2 days - Average sunshine days in December:
18.6 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is June (9.8 days).
Average UV index
Saint Charles, IA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Saint Charles, IA
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and September (Cloud cover 29).
Average visibility
Saint Charles, IA
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).